Bloodchief Ascension 
Enchantment
At the beginning of each end step, if an opponent lost 2 or more life this turn, you may put a quest counter on this enchantment. (Damage causes loss of life.)
Whenever a card is put into an opponent's graveyard from anywhere, if this enchantment has three or more quest counters on it, you may have that player lose 2 life. If you do, you gain 2 life.
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Cards that do something similar expected a card that isn't here?
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Luminarch Ascension 91%
$15.33#3239
"At the beginning of each opponent's end step, if you didn't lose life this turn, you may put a quest counter on this enchantment."
Sygg, River Cutthroat 88%
$4.23#3775
"At the beginning of each end step, if an opponent lost 3 or more life this turn, you may draw a card."
Y'shtola, Night's Blessed 87%
$4.14#2835
"At the beginning of each end step, if a player lost 4 or more life this turn, you draw a card."
Rain of Gore 82%
$8.69#18763
"If a spell or ability would cause its controller to gain life, that player loses that much life instead."
Fandaniel, Telophoroi Ascian 81%
$0.32#3498
"At the beginning of your end step, each opponent may sacrifice a nontoken creature of their choice. Each opponent who doesn't loses 2 life for each instant and sorcery card in your graveyard."
Perforating Artist 81%
$0.26#6783
"At the beginning of your end step, if you attacked this turn, each opponent loses 3 life unless that player sacrifices a nonland permanent of their choice or discards a card."
Ludevic, Necro-Alchemist 81%
#13644
"At the beginning of each player's end step, that player may draw a card if a player other than you lost life this turn."
Sarevok, Deathbringer 80%
$0.17#13864
"At the beginning of each player's end step, if no permanents left the battlefield this turn, that player loses X life, where X is this card's power."
The Chain Veil 80%
$5.64#2914
"At the beginning of your end step, if you didn't activate a loyalty ability of a planeswalker this turn, you lose 2 life."